CVE-2025-38193 (GCVE-0-2025-38193)

Vulnerability from cvelistv5 – Published: 2025-07-04 13:37 – Updated: 2026-05-11 21:23
VLAI
Title
net_sched: sch_sfq: reject invalid perturb period
Summary
In the Linux kernel, the following vulnerability has been resolved: net_sched: sch_sfq: reject invalid perturb period Gerrard Tai reported that SFQ perturb_period has no range check yet, and this can be used to trigger a race condition fixed in a separate patch. We want to make sure ctl->perturb_period * HZ will not overflow and is positive. tc qd add dev lo root sfq perturb -10 # negative value : error Error: sch_sfq: invalid perturb period. tc qd add dev lo root sfq perturb 1000000000 # too big : error Error: sch_sfq: invalid perturb period. tc qd add dev lo root sfq perturb 2000000 # acceptable value tc -s -d qd sh dev lo qdisc sfq 8005: root refcnt 2 limit 127p quantum 64Kb depth 127 flows 128 divisor 1024 perturb 2000000sec Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) backlog 0b 0p requeues 0
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < e0936ff56be4e08ad5b60ec26971eae0c40af305 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 2254d038dab9c194fe6a4b1ce31034f42e91a6e5 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 956b5aebb349449b38d920d444ca1392d43719d1 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < b11a50544af691b787384089b68f740ae20a441b (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 0357da9149eac621f39e235a135ebf155f01f7c3 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < f9b97d466e6026ccbdda30bb5b71965b67ccbc82 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 590b2d7d0beadba2aa576708a05a05f0aae39295 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 7ca52541c05c832d32b112274f81a985101f9ba8 (git)
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Linux Linux Affected: 2.6.12
Unaffected: 0 , < 2.6.12 (semver)
Unaffected: 5.4.297 , ≤ 5.4.* (semver)
Unaffected: 5.10.240 , ≤ 5.10.* (semver)
Unaffected: 5.15.186 , ≤ 5.15.* (semver)
Unaffected: 6.1.142 , ≤ 6.1.* (semver)
Unaffected: 6.6.95 , ≤ 6.6.* (semver)
Unaffected: 6.12.35 , ≤ 6.12.* (semver)
Unaffected: 6.15.4 , ≤ 6.15.* (semver)
Unaffected: 6.16 , ≤ * (original_commit_for_fix)
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Gerrard Tai inform\u00f3 que SFQ perturb_period a\u00fan no tiene comprobaci\u00f3n de rango, lo que puede usarse para activar una condici\u00f3n de ejecuci\u00f3n corregida en un parche independiente. Queremos asegurarnos de que ctl-\u0026gt;perturb_period * HZ no se desborde y sea positivo. tc qd add dev lo root sfq perturb -10 # valor negativo: error. Error: sch_sfq: per\u00edodo de perturbaci\u00f3n no v\u00e1lido. tc qd add dev lo root sfq perturb 100000000 # demasiado grande: error. Error: sch_sfq: per\u00edodo de perturbaci\u00f3n no v\u00e1lido. tc qd add dev lo root sfq perturb 2000000 # valor aceptable tc -s -d qd sh dev lo qdisc sfq 8005: root refcnt 2 limit 127p quantum 64Kb Depth 127 flows 128 divisor 1024 perturb 2000000sec Enviados 0 bytes 0 paquete (eliminados 0, sobrepasa los l\u00edmites 0, vuelve a poner en cola 0) backlog 0b 0p vuelve a poner en cola 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Party Advisory\"]},{\"url\":\"https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Third Party Advisory\"]}]}}"
  }
}


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